Danieli & C. Officine Meccaniche S.p.a.

Hyl Technologies S.a. De C.v.

Alessandro Martinis

Andrea Tavano

Michele Condosta

Jorge O Becerra-Novoa

Eugenio Zendejas-Martinez

Alfredo Poloni

Milorad Pavlicevic

Alessandra Primavera

Peter Tishchenko

David Rabascall

Henry Rafael Bueno

Ronald Victor Manuel Lopez-Gomez

Eugenio Zendejas Martínez

Eugenio Zendejas Martinez

Pablo Enrique Duarte Escareño

Luis Manuel Becerra Lucatero

Stefano Maggiolino

Raul Morales Serrano

Barbara Franco

Pablo Enrique Duarte-Escareño

Omar Della Gaspera

Jorge Eugenio Martinez Miramontes

Jorge-Octavio Becerra-Novoa

Daniela Dalle Nogare

Raúl Morales Serrano

Jorge Octavio Becerra-Novoa

The present invention provides a reduction system and method that can be operated with any proportion of gaseous hydrogen-containing gases and gaseous hydrocarbon-containing gases having the possibility of continuing its operation, ensuring an high process availability and negligible loss of production, when the gaseous hydrogen-containing gas for any reason is not available and allow the substitution of the gaseous hydrogen-containing gas with a gaseous hydrocarbon-containing gas with minor adjustments in the plant operation. The reduction system of the invention is designed to be implemented in new and already built direct reduction plants to operate efficiently and has lower capital and operation costs.

Direct reduction system and relative process

A container with lower vibrations, such as quaking and shaking as well as noise effects, known also as hooting, honking or howling, and an effective and cost-competitive method and device to decrease such phenomena during the discharge of granular material particles from silos, hoppers, bins, reactors and in general containers for storing or processing such granular material particles. The container includes at least one baffle that is attached to the container wall, in the lower portion or at the bottom of the tapered discharge part of said container, protruding towards the central axis of its tapered discharge part. The baffle forms a stagnant zone in the bed of the granular material particles in contact with the container wall whereby the particles in that zone flow under the friction against other particles instead of the friction between the particles and the wall.

Container, device and method for storing or processing particulate materials to minimize or eliminate vibrations such as quaking or shaking

A method and apparatus for producing direct reduced iron using a pre-treated make-up gas as a reducing agent in a direct reduced iron reactor are provided. The method involves pre-treating a stream of make-up gas containing heavy hydrocarbons by subjecting the stream to low temperature adiabatic reforming at a temperature between 300&#xb0; C. and 600&#xb0; C., prior to using the stream of make-up gas as a reducing agent for producing direct reduced iron. The method also involves adjusting the humidity content of the stream of make-up gas after the low temperature adiabatic reforming by bypassing the stream to selectively split it into a first part of the stream of make-up gas and a second part of the stream of make-up gas, subjecting the first part to water separation, and then mixing the first part with the second part to obtain a reducing stream to be sent to direct reduced iron production.

Method and apparatus for producing direct reduced iron utilizing a catalytical pretreatment of hydrocarbons as a source of reducing gas

A direct reduction process producing DRI from iron oxide particles by reduction at a about 750&#xb0; C. with a reducing gas mainly Hand CO, that also includes CO, Hand methane, a the reduction reactor and the top gas effluent from the reduction reaction after cooling/scrubbing is split. The resulting first top gas portion with a first hydrocarbon-containing make-up gas passes through a catalytic reformer yielding an improved hot reducing gas first effluent. The second top gas portion passes through a COremoval unit and then with the second hydrocarbon-containing make-up gas passes through a heater yielding a hot CO-lean recycle reducing gas second effluent. The first and second effluents are fed to the reducing zone of the reduction reactor as the reducing gas reactant. The flow rate of at least the second of the two make-up gases is regulated to control the carbon content of the DRI produced.

Direct reduction process with improved product quality and process gas efficiency

Direct reduction process and plant for producing DRI comprising a reduction reactor and at least one reducing gas heater typically comprising a convective heating section and a radiant heating section for raising the reducing gas temperature to a level adequate for iron oxides reduction to metallic iron, typically above 850&#xb0; C., wherein the reducing gas fed to the reduction reactor comprises a stream of reducing gas recycled from the reduction reactor and a make-up stream of coke oven gas containing carbon compounds which may form carbon deposits in the heating path of said heater, namely BTX and other complex carbon compounds. The heater is provided with means for feeding oxidizing agents, for example steam, steam and air and/or oxygen at predetermined heating tubes successively for eliminating the carbon deposits which may form inside the heating tubes of said heater without interrupting the operation of the plant. The make-up stream of cold COG can be combined with the recycled gas at a point in the gas heating path of the heater where the tubes have a skin wall temperature of at least 700&#xb0; C., or when the mixture of recycled gas and COG is at a temperature above 700&#xb0; C. for minimizing clogging or fouling of heating equipment.

Method and apparatus for production of direct reduced iron (DRI) utilizing coke oven gas

The present invention concerns a method and an apparatus for producing DRI (Direct Reduced Iron) utilizing a high-oxidation reducing gas containing carbon monoxide and hydrogen, derived directly or indirectly from the gasification of hydrocarbons or coal, with a high content of oxidants (HO and CO). The invention provides a more efficient method and plant comprising a reactor in which particulate material of iron ore comes into contact with a high temperature reducing gas to produce DRI, with lower investment and operating costs, avoiding the need for a fired heater for the reducing gas fed into the reduction reactor. The reducing gas is heated to a temperature above 700&#xb0; C. in two steps, a first step at a temperature below about 400&#xb0; C. to prevent the phenomenon of metal dusting, by exchange of sensible heat supplied by the stream of hot spent gas removed from the reduction reactor; and a second step by means of partial or total combustion with oxygen, maintaining the temperature of the combustion gas below the limits established by the construction materials of the combustion chamber.

Method and apparatus for producing direct reduced iron utilizing a source of reducing gas comprising hydrogen and carbon monoxide

An integrated steelmaking plant for merging continuous operation of a reduction reactor producing hot DRI with the batch operation of a DRI melting furnace(s). The reactor produces hot DRI for a DRI melting furnace or cold DRI continuously even when the DRI production exceeds the DRI consumption rate of the furnace or suffers long-term operational delays. The reduction reactor has a DRI cooling zone therein which is selectively operable for cooling DRI when the hot DRI produced in the reactor can't all be consumed by the DRI melting furnace and when the capacity of the DRI bin feeding the melting furnace is insufficient to accumulate additional hot DRI. No separate DRI cooling vessel plus its gas compressor and gas cooling-cleaning system is needed, thus decreasing capital and operational costs. This also permits a flexible and modular construction and operation of a steelmaking plant with high or low pressure reduction reactors.

Integrated steel plant with production of hot or cold DRI

Production method and apparatus for direct reduced iron (DRI), a.k.a sponge iron, by contacting iron oxides with recycled and regenerated hot reducing gases containing H& CO. This invention decreases uncontained emission of COto the atmosphere from combustion of carbon-bearing fuels in the reducing-gas heater by substituting, at least partially, a gas mainly comprising hydrogen in lieu of the usual carbon-bearing fuels. The hydrogen fuel stream, depleted of COby means of a physical gas separation unit (which can be a PSA/VPSA type adsorption unit, a gas separation membrane unit or a combination of both such units) is derived from at least a portion of regenerated reducing gases being recycled to the reduction reactor. The derived hydrogen fuel stream is combusted in the reducing gas heater and/or other thermal equipment in the reduction plant, thus decreasing the COemissions directly to the atmosphere.

[object Object]

Reduction process and relative plant for the production of metallic iron by means of the direct reduction of iron ore, in which a reduction shaft is connected to a source of reducing gas obtained from the gasification of coal. The process advantageously comprises a step in which a portion or all of the synthesis gas entering the plant circuit is processed to separate the methane from the rest of the components of said synthesis gas. The advantageous management of the extracted methane enables the entire reduction process to be optimized, making the efficiency of the process independent of the methane content in the original synthesis gas and making it possible to control the carbon content of the product more accurately and more easily.

Reduction process and plant

A direct reduction device ( ) of the gravitational type to obtain iron carbide starting from iron oxide, comprising a reduction and carburation reactor ( ) below which a cooling and passivation container ( ) is arranged wherein the iron carbide is suitable to be cooled and passivated, between the reactor ( ) and the container ( ) a valve for solids ( ) is interposed suitable to regulate the transfer of the iron carbide.

Direct reduction device to obtain metal iron with a high content of carbon in the form of carbide

Fume intake and cooling device for intake conduits (11,111,211) in electric arc furnaces (26a,26b), comprising a containing structure (28) associated at one end (12) with an aperture on the roof of the furnace and connected at the second end (13) with an intake and filter system (27), the containing structure (28) having, in cooperation with its inner sidewalls, cooling means, the cooling means comprising a pipe (14), which is spiral shaped and has turns (16) lying on a plane substantially at right angles to the longitudinal axis of the conduits (11,111,211), the turns (16) being distanced with respect to each other in such a way as to form interstices (20) between adjacent turns (16), the interstices (20) through which the fumes pass serving to anchor the slag.

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Pozzuolo del Friuli, Italy

Alessandro Martinis